AU2003226154A8 - Full complement antifriction bearing - Google Patents
Full complement antifriction bearingInfo
- Publication number
- AU2003226154A8 AU2003226154A8 AU2003226154A AU2003226154A AU2003226154A8 AU 2003226154 A8 AU2003226154 A8 AU 2003226154A8 AU 2003226154 A AU2003226154 A AU 2003226154A AU 2003226154 A AU2003226154 A AU 2003226154A AU 2003226154 A8 AU2003226154 A8 AU 2003226154A8
- Authority
- AU
- Australia
- Prior art keywords
- antifriction bearing
- full complement
- complement antifriction
- full
- bearing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
- F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
- F16C19/36—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers
- F16C19/364—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/02—Pretreatment of the material to be coated
- C23C14/027—Graded interfaces
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/34—Rollers; Needles
- F16C33/36—Rollers; Needles with bearing-surfaces other than cylindrical, e.g. tapered; with grooves in the bearing surfaces
- F16C33/366—Tapered rollers, i.e. rollers generally shaped as truncated cones
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2206/00—Materials with ceramics, cermets, hard carbon or similar non-metallic hard materials as main constituents
- F16C2206/02—Carbon based material
- F16C2206/04—Diamond like carbon [DLC]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2206/00—Materials with ceramics, cermets, hard carbon or similar non-metallic hard materials as main constituents
- F16C2206/02—Carbon based material
- F16C2206/06—Composite carbon material, e.g. carbon fibre reinforced carbon (C/C)
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2206/00—Materials with ceramics, cermets, hard carbon or similar non-metallic hard materials as main constituents
- F16C2206/80—Cermets, i.e. composites of ceramics and metal
- F16C2206/82—Cermets, i.e. composites of ceramics and metal based on tungsten carbide [WC]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
- F16C2240/60—Thickness, e.g. thickness of coatings
- F16C2240/64—Thickness, e.g. thickness of coatings in the nanometer range
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
- F16C2240/70—Diameters; Radii
- F16C2240/80—Pitch circle diameters [PCD]
- F16C2240/82—Degree of filling, i.e. sum of diameters of rolling elements in relation to PCD
- F16C2240/84—Degree of filling, i.e. sum of diameters of rolling elements in relation to PCD with full complement of balls or rollers, i.e. sum of clearances less than diameter of one rolling element
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2300/00—Application independent of particular apparatuses
- F16C2300/02—General use or purpose, i.e. no use, purpose, special adaptation or modification indicated or a wide variety of uses mentioned
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
- F16C33/6696—Special parts or details in view of lubrication with solids as lubricant, e.g. dry coatings, powder
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Rolling Contact Bearings (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/114,832 | 2002-04-02 | ||
US10/114,832 US6764219B2 (en) | 2002-04-02 | 2002-04-02 | Full complement antifriction bearing |
PCT/US2003/009845 WO2003085276A2 (en) | 2002-04-02 | 2003-03-28 | Full complement antifriction bearing |
Publications (2)
Publication Number | Publication Date |
---|---|
AU2003226154A1 AU2003226154A1 (en) | 2003-10-20 |
AU2003226154A8 true AU2003226154A8 (en) | 2003-10-20 |
Family
ID=28453851
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU2003226154A Abandoned AU2003226154A1 (en) | 2002-04-02 | 2003-03-28 | Full complement antifriction bearing |
Country Status (4)
Country | Link |
---|---|
US (1) | US6764219B2 (en) |
EP (1) | EP1497568A2 (en) |
AU (1) | AU2003226154A1 (en) |
WO (1) | WO2003085276A2 (en) |
Families Citing this family (43)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6994475B2 (en) * | 2003-03-14 | 2006-02-07 | The Timken Company | Coated rolling element bearing cages |
WO2004090361A2 (en) * | 2003-04-03 | 2004-10-21 | The Timken Company | Corrosion tolerant rolling element bearing |
WO2004113748A1 (en) * | 2003-06-11 | 2004-12-29 | Ishikawajima-Harima Heavy Industries Co., Ltd. | Rotating member, housing, bearing, gearbox, rotating machine, shaft structure, and surface treatment method |
US6945699B2 (en) * | 2003-07-16 | 2005-09-20 | Emerson Power Transmission Manufacturing, L.P. | Bearing having anodic nanoparticle lubricant |
WO2006002351A1 (en) * | 2004-06-23 | 2006-01-05 | Advanced Components & Materials, Inc. | Electro-composite coating for flexible seals and method for applying the same |
JP2006022935A (en) * | 2004-07-05 | 2006-01-26 | Ntn Corp | Tapered roller bearing |
US7806598B2 (en) * | 2005-03-18 | 2010-10-05 | The Timken Company | Method of protecting roller element bearing assemblies against oil-out conditions and bearing assemblies made thereby |
US20060291764A1 (en) * | 2005-06-23 | 2006-12-28 | The Timken Company | Clamping arrangement for securing an annular component to a shaft |
US7910217B2 (en) * | 2006-11-07 | 2011-03-22 | Ues, Inc. | Wear resistant coatings for race land regions of bearing materials |
PL2118503T3 (en) * | 2007-02-28 | 2013-04-30 | Timken Co | Bi-directional tapered roller bearing assembly with improved wear resistance |
SE530892C2 (en) * | 2007-06-01 | 2008-10-07 | Skf Ab | A bearing component for a rolling bearing or a sliding bearing |
US7931436B2 (en) * | 2007-09-12 | 2011-04-26 | United Technologies Corp. | Roller bearings, and struts and gas turbine engines having such bearings |
US8376902B2 (en) | 2008-06-13 | 2013-02-19 | The Timken Company | Epicyclic gear system with flexpins and helical gearing |
JP2010060116A (en) * | 2008-09-05 | 2010-03-18 | Ntn Corp | Rolling bearing |
CN102428284B (en) * | 2009-05-19 | 2016-01-27 | Ntn株式会社 | Roller with retainer, the roller bearing with retainer and retainer |
WO2011057728A1 (en) * | 2009-11-13 | 2011-05-19 | Aktiebolaget Skf | Bearings |
EP2554866B1 (en) * | 2010-03-30 | 2018-11-21 | NTN Corporation | Anti-friction bearing |
EP2643602A1 (en) * | 2010-11-25 | 2013-10-02 | Aktiebolaget SKF | Bearing and method of inhibiting crack propagation in a bearing component |
DE102011008958A1 (en) * | 2011-01-19 | 2012-07-19 | Imo Holding Gmbh | Rotor bearing for a wind turbine |
JP5935370B2 (en) * | 2011-03-25 | 2016-06-15 | 株式会社ジェイテクト | Roller bearing |
DE102011075972A1 (en) * | 2011-05-17 | 2012-11-22 | Schaeffler Technologies AG & Co. KG | Spherical roller thrust bearings |
WO2013043822A2 (en) | 2011-09-22 | 2013-03-28 | The Timken Company | Compact planetary gear system with stiffened carrier |
JP6081053B2 (en) * | 2011-10-31 | 2017-02-15 | 三菱重工業株式会社 | Radial roller bearings, rotating machines using radial roller bearings, and design methods for radial roller bearings |
US9109623B2 (en) | 2013-04-29 | 2015-08-18 | Roller-Bearing Company of America, Inc. | Integrated cartridge double-row ball bearing for a nuclear reactor control rod drive mechanism |
DE102013209863A1 (en) * | 2013-05-28 | 2014-12-04 | Schaeffler Technologies Gmbh & Co. Kg | Coated component |
FR3045561B1 (en) * | 2015-12-17 | 2020-06-05 | Ntn-Snr Roulements | BEARING OF A LUBRICATED BLADE FOOT |
DE102016202149A1 (en) * | 2016-02-12 | 2017-08-17 | Schaeffler Technologies AG & Co. KG | Sheave bearing arrangement |
US10738821B2 (en) | 2018-07-30 | 2020-08-11 | XR Downhole, LLC | Polycrystalline diamond radial bearing |
US11014759B2 (en) * | 2018-07-30 | 2021-05-25 | XR Downhole, LLC | Roller ball assembly with superhard elements |
US11286985B2 (en) | 2018-07-30 | 2022-03-29 | Xr Downhole Llc | Polycrystalline diamond bearings for rotating machinery with compliance |
US11187040B2 (en) | 2018-07-30 | 2021-11-30 | XR Downhole, LLC | Downhole drilling tool with a polycrystalline diamond bearing |
US11035407B2 (en) | 2018-07-30 | 2021-06-15 | XR Downhole, LLC | Material treatments for diamond-on-diamond reactive material bearing engagements |
US11054000B2 (en) | 2018-07-30 | 2021-07-06 | Pi Tech Innovations Llc | Polycrystalline diamond power transmission surfaces |
US10465775B1 (en) | 2018-07-30 | 2019-11-05 | XR Downhole, LLC | Cam follower with polycrystalline diamond engagement element |
US11371556B2 (en) | 2018-07-30 | 2022-06-28 | Xr Reserve Llc | Polycrystalline diamond linear bearings |
CA3107538A1 (en) | 2018-08-02 | 2020-02-06 | XR Downhole, LLC | Polycrystalline diamond tubular protection |
US11603715B2 (en) | 2018-08-02 | 2023-03-14 | Xr Reserve Llc | Sucker rod couplings and tool joints with polycrystalline diamond elements |
DE102019110299A1 (en) * | 2019-04-18 | 2020-10-22 | Schaeffler Technologies AG & Co. KG | Tapered roller bearings |
US11136808B2 (en) * | 2019-06-27 | 2021-10-05 | Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Bamberg | Structural features for coating |
US11614126B2 (en) | 2020-05-29 | 2023-03-28 | Pi Tech Innovations Llc | Joints with diamond bearing surfaces |
US12006973B2 (en) | 2020-11-09 | 2024-06-11 | Pi Tech Innovations Llc | Diamond surface bearings for sliding engagement with metal surfaces |
WO2022099184A1 (en) | 2020-11-09 | 2022-05-12 | Gregory Prevost | Continuous diamond surface bearings for sliding engagement with metal surfaces |
DE102023101922A1 (en) | 2023-01-26 | 2024-08-01 | Gottfried Wilhelm Leibniz Universität Hannover, Körperschaft des öffentlichen Rechts | Dry lubrication of rolling bearings |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH640885A5 (en) | 1978-07-21 | 1984-01-31 | Suisse Horlogerie Rech Lab | MACHINE ELEMENTS WITH A HARD COVER. |
JPS5557717A (en) | 1978-10-25 | 1980-04-28 | Koyo Seiko Co Ltd | Rolling bearing |
JPS58113629A (en) | 1981-12-25 | 1983-07-06 | Koyo Seiko Co Ltd | Rolling bearing |
US5067826A (en) | 1987-03-31 | 1991-11-26 | Lemelson Jerome H | Ball and roller bearings and bearing components |
US5228786A (en) | 1987-12-15 | 1993-07-20 | Koyo Seiko Co., Ltd. | Full type ball bearing for turbochargers |
US5165804A (en) | 1991-09-03 | 1992-11-24 | General Electric Company | Rolling element bearing having wear resistant race land regions |
JPH066949A (en) | 1992-06-19 | 1994-01-14 | Nec Ibaraki Ltd | Spindle motor |
JPH06193637A (en) | 1992-12-25 | 1994-07-15 | Ntn Corp | Rolling bearing |
NL9401873A (en) | 1994-11-09 | 1996-06-03 | Skf Ind Trading & Dev | Rolling bearing with improved wear characteristics. |
US5593234A (en) | 1995-05-16 | 1997-01-14 | Ntn Corporation | Bearing assembly with polycrystalline superlattice coating |
JP3002957B2 (en) | 1995-09-11 | 2000-01-24 | 光洋精工株式会社 | Rolling bearing and method of forming lubricating film for rolling bearing |
JPH09177774A (en) | 1995-12-27 | 1997-07-11 | Ntn Corp | Tapered roller bearing |
US5700094A (en) | 1996-01-25 | 1997-12-23 | Caterpillar, Inc. | Bearing assembly having improved fretting and abrasion resistance |
NL1003141C2 (en) | 1996-05-15 | 1997-11-18 | Skf Ind Trading & Dev | Rolling bearing with improved wear characteristics, and rolling element for such a bearing. |
NL1007046C2 (en) | 1997-09-16 | 1999-03-17 | Skf Ind Trading & Dev | Coated rolling bearing. |
SE9803957L (en) | 1998-11-18 | 2000-05-19 | Skf Nova Ab | Rolling bearing with coated components |
US6357923B1 (en) | 1999-02-19 | 2002-03-19 | Nsk Ltd. | Rolling bearing and bearing device |
US6318898B1 (en) | 1999-10-15 | 2001-11-20 | Reliance Electric Technologies, Llc | Corrosion-resistant bearing and method for making same |
WO2001033091A1 (en) | 1999-10-29 | 2001-05-10 | The Timken Company | Antifriction bearing for use in a corrosive environment |
-
2002
- 2002-04-02 US US10/114,832 patent/US6764219B2/en not_active Expired - Lifetime
-
2003
- 2003-03-28 AU AU2003226154A patent/AU2003226154A1/en not_active Abandoned
- 2003-03-28 EP EP03746084A patent/EP1497568A2/en not_active Withdrawn
- 2003-03-28 WO PCT/US2003/009845 patent/WO2003085276A2/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
EP1497568A2 (en) | 2005-01-19 |
WO2003085276A3 (en) | 2004-04-08 |
US20030185478A1 (en) | 2003-10-02 |
AU2003226154A1 (en) | 2003-10-20 |
US6764219B2 (en) | 2004-07-20 |
WO2003085276A2 (en) | 2003-10-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MK6 | Application lapsed section 142(2)(f)/reg. 8.3(3) - pct applic. not entering national phase |